搜搜做题作业网____ three years since i left school.Now I miss my classmate
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____ three years since i left school.Now I miss my classmate very much.A.It was B.It have been
A.It
was B.
It have been C.It is D.It had been
为什么不选b呢?
A.It
was B.
It have been C.It is D.It had been
为什么不选b呢?
选C,It is + 段时间 + since.../ It has been + 段时间 + since...表示“从……起已有多长时间了”.两句型意思相同,前者是规范说法,后者是口语说法.
用法：since从句中常用一般过去时,若从句中是持续性动词的一般过去时,则表示该动作结束有多长时间了.如：
It is three years since he smoked.他不吸烟已有3年了.
试比较：
It is three years since he began to smoke.
t is three years since he has smoked.两句均意为：他吸烟已有3年了.
注意：在这种结构中,since引导的从句绝对不能用否定式的谓语动词来表示否定意义,试比较：
他好久没学汉语了.
误：It is a long time since be didn’t study Chinese.
正：It’s a long time since he studied Chinese.
(studied为持续性动词,应从其动作结束时算起)
用法：since从句中常用一般过去时,若从句中是持续性动词的一般过去时,则表示该动作结束有多长时间了.如：
It is three years since he smoked.他不吸烟已有3年了.
试比较：
It is three years since he began to smoke.
t is three years since he has smoked.两句均意为：他吸烟已有3年了.
注意：在这种结构中,since引导的从句绝对不能用否定式的谓语动词来表示否定意义,试比较：
他好久没学汉语了.
误：It is a long time since be didn’t study Chinese.
正：It’s a long time since he studied Chinese.
(studied为持续性动词,应从其动作结束时算起)
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It three years since I smoked.翻译
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